Silencer.



G. ROUBEAU.

I v v SILENCER.

APPLICATION FILED APR. 21. I914.

1,151,400. v Patented Aug. 24, 1915.

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GABRIEL ROUBEAU, OF EARIS, FRANCE.

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To all whom it may concern:

Be it known that I, GABRIEL ROUBEAU, a citizen of the Republic of France, and a resident of 10 Rue Labie, Paris, France, have invented-a new and useful Silencer, of which the following is a specification.

This invention relates to a device for the admission of secondary or supplementary air for internal combustion engines; the device is connected to the induction pipe which conveys the gases from the carbureter to the engine and is arranged in such a way that this admission takes place silently.

This device is represented in the accompanying drawings by way of example.

Figure 1 is a section taken on line 11 of Fig. 2, and Fig. 2 is a section taken on line 2-2 of Fi 1.

The device consists of a casing or box a in which is mounted a bafiie b, which is provided with air-admission channels or orifices c and orifices or channels d to allow the air drawn by the engine into the chamber 6, formed by the upper wall of the bafile and that of the casing a, to pass into the chamber 7, formed by the lower wall of the bafiie and the bottom of the casing. A passage, which is continued outside the casing a by a pipe h leading to the induction pipe connecting the carburetor to the engine, conveys to the latter the air admitted to the chamber f.

The baflie 6 comprises a central orifice i in which is mounted a valve y to determine or to shut 011' the admission of air to the passage g. This valve is provided with a screw threaded controlling stem is having a knob or other suitable means Z whereby it may be operated.

The working of the device is as follows When it is' desired to admit a quantity of supplementary air to the gaseous mixture drawn in by the engine, the valve j is raised from its seat by turning the stem is; the

suction of the engine then draws in air which passes through the orifices c, d, the

' passage 9, the pipe h, and thus reaches the pipe connecting the carbureter to the engine, the air mixing in this way with the gases drawn in by the engine.

It is necessary to bear in mind that the moments of admission to the motor, which cause the st ction of the air through the apparatus, succeed each other with a very great rapidity and that each one of these suction 'efiorts is very brusque and also of very short Specification of Letters Patent.

Patented Aug. 24, 1915.

Application filed April 21, 1914. Serial No. 833,408.

duration. As a consequence of this the debrusqueness and rapidity in the chambers f and e, the air being sucked from each of these chambers more swiftly than it can enter through the orifice d and crespectively.

The perforated diaphragm d has a bafiling action which prevents the brusque suction of the air by the motor from chamber f from being transmitted with equal brusqueness to the entry orifices 0 opening to chamber e and thus prevents the whistling noise which would result from a violent intake of the air at this point. The diaphragm fills the roll of a regulating baflie which transforms the successive suction efforts exerted in the chamber 7 beneath it to a suction admission less violent and more continuous at the entry orifices c which connect the upper chamber 6 to atmosphere.

As will be readily understood, the adjust-- ment of the volume of air is obtained by opening more or less the valve 3'.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. A silencer device for explosion engines, comprising an inner chamber opening to the engine, a regulating valve controlling said opening, an outer chamber opening to atmosphere, and a baiile between said chambers serving to render the pressure in the outer chamber more uniform than that in the inner chamber and thus to steady the flow through the passage opening to the outer chamber from atmosphere.

2. A silencer device for explosion engines, comprising an inner chamber opening to the engine, a regulating valve controlling said opening, an outer chamber opening to atmosphere, and a perforated plate arranged between said chambers and constituting a bafiie through which communication is'established between the chambers whereby the pressure in the outer chamber is rendered more uniform than that in the inner chamber thus to steady the flow through the passage opening to the outer chamber from atmosphere.

3. A silencer device for explosion engines, comprising a casing, an independent baflie inserted within the same and dividing it into an inner chamber communicating with the engine, and an outer chamber communicatin with atmosphere and a valve corifrolling t e connection between the inner amber and the engine.

the interior of the casing into an innerchamber opening through said casing to the engine, and an outer chamber opening to atmosphere, together with a valve carried b v said casing and controlling the passage from the inner chamber to the engine.

5. A silencer device for explosion engines, comprising acasing mounted therein and having a perforated baflie plate dividing the interior of the casing into an inner chamber opening throu h said casing to the engine, and an outer c amber opening through perforations in the casting to atmosphere, to-

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gether with a valve carried by said casting and controlling the passage from the inner chamber to the engine.

6. An intake silencer for carbureters, comprising a casing having an outer chamber opening to atmosphere and an inner chamber opening to the suction pipe, and means for transforming the intermittent violent suction efiorts exerted upon the air in the inner chamber into a relatively continuous suction efiort at the intake apertures opening to the outer chamber.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

GABRIEL ROUBEAU.

Witnesses:

CHAS. P. PRESSLEY, LEON PEILLET. 

